I got a little bored the standard "Blog Archive" widget. So I searched for a plain list of post on the widget site without luck but
I found this useful helperblogger page
which provided a script that uses below API to get the entire list of posts parse it and show it nicely.

GET https://www.blogger.com/feeds/blogID/posts/default

(Full documentation of Blogger's API can be found here)
So, what I did was to modify the code a bit for visual purposes and then brought it into my code. Just set below code as an "HTML/JS Widget":